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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91950dd701717df1563149c08f179b9a67a71b886992394e62d5db3bc7632040' 
  AND token = 'KmzXRE/yVHiuY5Kn9C7A+CZodMNSUtrobUjA3OIusbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}